More than 30 Christmas Day and Dec. 26 flights on the Delta system werecanceled or delayed after flight attendants failed to report to work.Delta spokesman Joshua Smith wouldn't speculate on the obviouscoincidences. "I don't want the flight attendants portrayed as aproblem," he told The Atlanta Journal-Constitution. "They are professionals. It's hard to say what the exact reason is." Deltawas the only airline that had mass cancellations Thursday. Posted 8:20 a.m. ET